Selecting device for telephone-exchanges.



No. 871,092. PATENTED NOV. 12, 1907. F. A. LUNDQUIST.

SELECTING DEVICE FOR TELEPHONE EXCHANGES.

APPLICATION FILED JAN.16, 1905.

a SHEETS-SHEET 1.

PATENTED NOV. 12, 1907.

F. A. LUNDQUIST. SELECTING DEVICE FOR TELEPHONE EXEEANEES.

APPLIOATION FILED JAN. 16. 1905.

3 SHEBTSSHE"J 2.

Winesazs;

PATENTED NOV. 12, 1907.

, PQA. LUNDQUIST. SELECTING DEVICE FOR TELEPHONE EXCHANGES.-

APPLICATION FILED JAN.16. 1905.

3 SHEETS-SHEET 3.

WiTrizsses and quickly make connections to any one of a large pivotedtwo weights 116 which partially and are adapted to produce frictionalcontact with, a

, hook89 engages a pin 119 on one of the weights 116 to stationary disk117. When the pointer 83 V UNITED STA ES PATENT OFFICE.

FRA'NK A. LUNDQUIST,- OF CHICAGO, ILLINOIS.

SELECTING DEVICE FOR TELEPHONE-EXCHANGES.

To all whom it may concern: I Be it known that I, FRANK A. LUNDQUIST, acitizen of theUnited States of America, and a resident of Ohicago,county of Cook, and State of Illinois, have invented c ertain' new anduseful Improvements in Selecting Devices for Telephone-Exchanges, ofwhich the following is a specification. I w My invention relates totelephone exchanges and more particularly to the calling devices used atthe i local stations of an automatic exchange. I It has for its objectthe simplification of the process by which a'subscriber at any onestation can easily number of'other stations.

In the accompanying drawings Figure l is a front elevation of thetelephone box of a local station; Fig. 2 is a view of the interior ofthe box showing part of the electric circuits; Fig. 3 is an enlargedview of part of the mechanism on the front cover of the telephone box,the upper portion being removed; Fig. 4 is a section on line 44 of Figs.2 and 3; and Fig. 5 is a dia gram of the electric circuits for onetelephone and the switchingmechanism associated therewith.

'On the front of the telephone box 82 is a pointer 83 which is movableby a hand over the numbered dial 84. The pointer 83 is mounted on aspindle 85, on the inner part of which is a spring 86, a gear 87, aratchet wheel 88,,a hook 89, and a lever 38. The spring 86 turns thespindle 85 so as to hold the handle to thepointer 83 normally against-astop pin 110. Another stop pin 111 prevents the pointer being moved toofar. The'ratchet wheel 88 is secured to the spindle 85, butthe gear 87-is loose and is provided with a pawl 112 which engages'the teeth of theratchet wheel. When thepointer 83 is moved by hand, the ratchet wheel 85turns under the pawl 112, but when released the spring 86 causes theratchet wheel to drive the gear 87. The gear- 87 is connected by a trainof gearing to the spindle 113, tothe inner end of which is secured amutilated contact disk 13 and a disk of insulation 114. Alsosecuredo'nthe spindle 113 is alever 115 to which are surround,

I hitsbeeh moved'by hand and released, the spring 86 drives the spindle.113 rapidly in the direction of the arrow, but the centrifugal force ofthe weights 116 causes them to bite on the disk 117 and thus act as agovernor to prevent too rapid rotation. Secured to an insulating block118.-is a spring contact 12 which normally bears each rotation of thespindle 113 comes into electrical contact with Specification of LettersPatent.

- Original application filed August 8, 1903. Serial N 0. 168.694.

Serial No. 241,247-

stop. them and prevent their'momentum'from throw- Patented Nov. 12,1907. Divided and this application filed January 16. 1905.

ing a strain upon the gearing. In normal position the lever 38 has oneend bearing against a contact point 37 and the other end against aU-shaped or forked lever 14. Adjacent to one arm of the lever 14 is acontact 25, and to the other arm is a contact strip 15. ,Normally thelever 38 holds the lever 14 away from the contact 25 and into electricalconnection with the contact l5. The'contact pieces 13, 14 and 38 are allin electrical connection with the base or plate 120, so that anelectrical connection to one is free to pass to either of the others.'lherest of the contact devices 'at the telephone are all insulated.

When the pointer 83 has been moved by hand and released. the spring 86will move the pointer towards zero, and the parts on the inside of thecover, in the directionsof the arrows of Fig. 2. The movement of contact15 and make it to contact 25. These parts are so related to each otherthat a movement of the pointer 83 to the point 0 on the dial 84, willmove the ratchet wheel 88 one tooth, and a release of the pointer 83willgive the spindle 113 one rotation so as to produce one contact between12 and 13, which contact will occur after the connection is brokenbetween 14 and 25 and made between 14 and 15. If the pointer 83 is movedto.l on the dial 84, the disk 13 will be given two rotations and maketwo contacts with 12, during one of which 14 is in contact with 25, andduring the other of which 14 is in contact with 15. If moved to 2 on thedial, there will be two contacts between 12 and 13 while 14 is incontact with 25 and one while in contact with 15. It will therefore beapparent that, as 13 and 14 are on aicommon base, the lever 14 acts as aswitch to throw the last contact of any series made between 12 and 13from one line to another. Also that the figureor number on the dial 84to which the pointer 83 is moved, represents the number of contacts madebetween 12 andl3 before the switch 14 throws the connection from theline represented by contact 25 to that represented by contact 15.

The receiver hook H, when rising in the ordinary manner, connects to alever 49, and when descending,

first moves 49 so as to make electrical connections between 47, 48, 49and H, and then releases 49 so as to break these connections. Briefly,the pin on the hook H engages the rear edge of the lever 49, and, as

the hook descends, the pin pushes the lever forward on its pivot untilthe pin lever when the lever falls clears the lower edge of the ba k toits original position.

When the-hook rises the pin passes under the lever 49 by bending itoutward, Also at the telephone the -.,customaryreceiver'R,' inductioncoil E, transmitter T, battery Y, generator G, ringer F, and certaincontact devices which will be apparent irom the description of theelectric circuits.

v The switching 'mechanisin'which is associated 'with.

the devices so :far described is illustrated diagrammatother stations.There are also a releasing magnet D the present application-and is shownhere ically only for the purpose of illustrating the circuits tacts with-ZOand 125.

and certain connections and contacts associated with the-switchingmechanism, the object of which will .become apparent in thedescriptionof the circuits.

The switching mechanism does not form a part of diagrammatover whichimpulses are sent by the calling device.

' Assuming that a subscriber wishes to call telephone "No. 345, theoperation would be as iollowsz-H re-v moves his receiver B when the hookH rises to make con- He then moves his pointerBS, which, upon release,runs back to a point just beyond 0 on the dial S4.' Moving the pointer83 breaks the connection between 14 and 15, which connection is notreestablished until just before the pointer reaches its normal position.lnrunning back to normalposition the disk lit makes a series ofcontacts-with the springlfl. Except for the last one, these.contacts'are without effect, because all connections are open at some point,consequently for the first movement of the pointer 83 the distance ofthis movement is immaterial. At the last contact between 12 and 13 thecurrent flows from battery X-1011-12-13 base -1415-lii-17l8l9 20- H 2122-23-- A 24'50100-102'X. This circuit I call circuit A because itpasses through the magnet A, and a current 62 so as to bringthe'pointers 73 flowing through circuit A causes the pointer P to be movedone step in the direction of the arrow. The first time the currentflows-through A after removing the receiver R, the pointer P is movedinto connection to line 31. On a second movement of the pointer-83, eachsuccessive contact between 12 and 13 (except thelast) sends a currentfrom X-l.0111-12.-13-base, 14-25- 26272 S29-3O P 3 l B 5O1OO 102 X. Thisis called circuit B and acts to swing the platiorm to successive points76 in arcs described from the pivot 61. The last'cont-act reproduces acurrent through circuit'A and moves the pointer P to the next contact K.A third movement l l i of the pointer 83 will result the same as thesecond, ex-' cept that the pointer P, being point K, the current willflow stead of magneth.

6. The final contact on a different contact through magnet C inin thiscase also reproduces a current through magnet A which moves the pointerP to the nextcontact point K and puts it into connection with theselected point 76 on the first table 75. -It

This would be through circuit 7 will from 12 to 18 byway oi 13-l4l516and'l7. On the front of the telephone box is a push button M by which .acontact may be made between 18 and 127 so that the current may flow from12 to l 8.by way of 126 and'127. It will therefore be apparent that acurrent can be sent through circuit A either by the final contact frommoving the pointer 83 or by pushing the button M.

Ret urning again tothe process of making connections to telephone No.345 it will be seen that the subscriber removes his receiver and turnsthe pointer 83 an indefinite (any) distance beyond 84. This results inmoving the pointer P one space. He thenturns the pointer 83 to thefigure A (for the tens) and lets it return to normal position. Thisresults in sending tour successive currents over circuit ,B which movesall of the pointers 73 t0 the radial rows representing the forties 'onthe table -7 5, and also another current'over circuit A which moves P tothe next contact K. He then turns the pointer 83 to the figure 5 (forthe units) and lets it return to normal. This results in successivecurrents over circuit C and one over circuit A, which moves the pointers-73 to the points five on the rows of forties, or the points 45 on eachtable, and also moves the pointer P into connection with the pointer730i the first table 75. To shift it to 345 he may either turn thepointer 83 three. times to O on the dial 84, or preferably push thebutton M three times. This results in shifting the pointer P toconnection with the table of three hundreds. To recapitulate, thesubscriber removes his receiver, moves his pointer 83 any distance,then' to ,4 then to 5, then pushes the .button three times. That thetime consumed in this be noticed that in circuit A the current flows Oon the dial 1 operation may be'as short as possible; the spring 86 andthe governor 116 are so related to each other that the successivecontacts will be made as rapidly as it is practical for the magnetsoperations. While the telephone connected to in the cated to thesubscriber by that number, I prefer to use adifferent system ofnumbering that will give the subconnection should be made. For example,the telephone which would actually be No. 345, I would describe to thesubscriber as No. 145- The first thr'ee figures would indicate thepoints towhich the pointer 83 is successively moved, and the figureafter the dash the numberof times the button is pushed. Assuming thatconnections have been niadeto the proper telephone in themannerdescribed, the subscriber turns the crank oi the generator Gcausing a contact between 34 and 35, when the current flows as follows-o-3 -35-s6-37 3s+baSe-14 -15 1 el7'18-19-2O H 2l-2223--A-24 -50 along100 to 50 of the called telephone. The details of this circuit, and ofthe talking circuit between stations, are given in full in theapplication from which this is and are not material to the present case.

divided,

-Hanging up the receiver breaks allconnections and returns pointers Pand 73 to their normal position in the following manner:-The descent ofthe hook H makes contacts between 47, 48, 49 and H when at current flows:X-10:4G47-4S49H2 1-22-23 scriber more precise information as to how theproper A, B, and C to perform their preceding description is No. 345,and may be indi- V A 24 .5 00 2 This actuats A and causes sending asmany electrical impulses over a given course as 30. to make a contactbetween 52 and 53 during the time when there isa contact between 47 and48. This causes a second current to fiow:X1046-4748 5l'27 28-5253D-54-50100102-X. The current through D releases the various partsfrom their propelling magnets, A, B and C and permits the respectiveretracting springs to return to their normal positions.

What I claim is 1 In a selecting device, a dial provided with numbers onits face, a pointer movable by hand to any position on said dial, meansfor automatically returning said pointer to its normal position, meansfor making a series of electrical contacts by the movement of saidpointer, two lines or courses over which electrical impulses may besent, means whereby said electrical contacts will cause as manyelectrical impulses to be sent over one of said lines as wasindicatedonthe dial by the primary movement 01' said pointer, and meanswhereby one additional electrical impulse will be automatically sentover the other line after the impulses have ceased over the first line.

2. In a selecting device, a numbered dial and a pointer therefor, meanswhereby said pointer may be moved by hand to any position on said dialand be automatically returned to its normal position, means forautomatically are indicated on the dial by the manual movement of saidpointer, and means for automatically sending one additional'impulse overa different course after the impulses have ceased over the first course.

3. A numbered dial, a pointer adapted to be moved to any position onsaid dial, automatic devices for returning said pointer to a normalposition, means controlled by the movement of said pointer for sending aseries of electrical impulses over a given course, a switch, and meansfor operating said switch by the movement of said pointer so as to sendan additional electrical impulse over a second (,Olll'SE.

4. The combination with a numbered dial, a pointer and automatic devicesfor moving said pointer over said dial, of a line over which electricalimpulses may be sent-by the movement of said pointer, a switch locatedin said line, a second line adjacent to said switch, and meanscontrolled by the terminal portion of a movement of said pointer wherebysaid switch is moved so as to transfer an impulse following a series ofimpulses from the first line to the second line.

Signed at Chicago, ill. this 13th day of Jan. 1905.

FRANK A. LUNDQUIST.

Witnesses C. L. REDFIELD, II. A. Rtcnninnn.

